JEE Main & Advanced
Physics
Wave Mechanics
JEE PYQ-Wave Mechanics
question_answer
A train is moving on a straight track with speed . It is blowing its whistle at the frequency of 1000 Hz. The percentage change in the frequency heard by a person standing near the track as the train passes him is (speed of sound ) close to [JEE MAIN 2015]
A) 18%
B) 24%
C) 6%
D) 12%
Correct Answer:
D
Solution :
[d]
Frequency increases while approacting and decreases while receding.